Integrating Multispectral and Unmanned Aerial Vehicle Thermal Infrared Remote Sensing With In-Situ Radon Measurements to Detect Submarine Groundwater Discharge in Onslow Bay, NC

Authors: Raymond Moore*, University of North Carolina - Wilmington, Eman Ghoneim, University of North Carolina Wilmington, Peter Zamora, University of North Carolina Wilmington, Dave Wells, University of North Carolina Wilmington
Topics: Coastal and Marine, Remote Sensing, Water Resources and Hydrology
Keywords: UAS, Radon, Groundwater, PIX4D
Session Type: Poster
Day: 4/4/2019
Start / End Time: 9:55 AM / 11:35 AM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: No File Uploaded

Submarine groundwater intertidal discharge (SGID), the continuous flow of water from coastal aquifers to the ocean, is as important in the delivery of fresh water as riverine sources in the southern Onslow Bay coastal region. Anthropogenically-derived terrestrial nutrient contributions from SGID can considerably degrade coastal ecosystems. Temperature gradients in sea surface temperature (SST) in nearshore sites of discharge can be linked to SGID due to groundwater being insulated from solar radiation until discharge. This study utilized innovative remote sensing techniques using thermal infrared data from multispectral satellite and Unmanned Aerial System (UAS) TIR imaging sensor to locate point-source SGID anomalies, with unparalleled accuracy and over a vast areal extent . In addition, in-situ radon, temperature, salinity, and global positioning coordinates were measured during UAS-TIR imaging survey for data validation. Relative to commonly used chemical tracing techniques, utilizing remote sensing TIR data, is a more cost-efficient, spatially-accurate, and time-efficient method for monitoring SGID.

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